Hello Martin Mari,

To restore the initial behavior you need to execute the following JavaScript code for that particular tab:

var tab = $find("RadTabStrip1").get_tabs().getTab(1);
tab.set_postBack(true);
tab.set_pageViewID(null);

Then on the server side you need to add a check inside the TabClick event handler to avoid multiple instantiation of the same RadPageView object:

        protected void RadTabStrip1_TabClick(object sender, RadTabStripEventArgs e)
        {
            if (string.IsNullOrEmpty(e.Tab.PageViewID))
            {
                AddPageView(e.Tab);
            }
            e.Tab.PageView.Selected = true;
        }

Regards,
Albert
the Telerik team